Construction management, on the drawing
Santix is a construction site and project management app where the site manager, engineers, architect and subcontractors work on the same drawing. Upload a DWG, DXF or PDF, tap a room, leave a note with a photo.
Coming soon to the App Store. Early access through TestFlight.
What is Santix?
What is Santix? A construction site and project management app for building contractors, on iPhone and iPad. The drawing is the centre: notes, revisions, progress and room data sit on the sheet, while the schedule, contracts, procurement, budget and documents link to the same project.
Owners, project managers, site managers, field engineers, architects and subcontractors share one project; each role sees only what it is allowed to. It keeps recording without a connection. Built in Türkiye for Turkish site practice: progress-payment deductions, central-bank exchange rates, room schedules and title-block reading follow local conventions.
What does a day on site look like in Santix?
One day on the sample project Ataşehir Blok B. Nobody types the same thing twice; each step builds on the previous record.
| Time | Who | What happens |
|---|---|---|
| 07:30 | Site manager | Checks late items, revisions awaiting approval and expiring documents on the overview. |
| 08:00 | Site manager | Hands out the day’s work to subcontractors as pins, each with sheet, room, due date and photo. |
| 10:00 | Field engineer | No signal in the basement; pins a waterproofing defect with photo and voice note, saved on the device. |
| 13:00 | Subcontractor | Finishes the tile grout and marks the pin ready for checking with a photo. |
| 15:00 | Field engineer | Inspects and closes the pin, marks the finished tiled area on the drawing. |
| 16:30 | Architect | Answers a revision request from the office and uploads the new sheet version; pins move across. |
| Month end | Site manager and owner | The subcontractor’s payment is calculated cumulatively, deductions applied, approved by amount. |
A note stays where it belongs on the drawing
Drop a pin, add photos, a voice note or video, assign it, set a due date. Instead of a photo lost in a chat group, an item with a place on the drawing, an owner and a date.
- Six typesTask, defect, information request, observation, safety, revision request.
- Status shown by shape tooOpen, in progress, awaiting check, done; shapes differ for colour-blind users.
- Subcontractors see their ownThey close assigned items with a photo and never see other firms’ items.
- Survives new versionsWhen a sheet is revised, pins move to the new version by drawing coordinates.
Tap a room, its data sheet opens
Net area, perimeter, clear height, wall and ceiling area; floor, wall and ceiling finishes; doors and windows. Every value says where it came from.
- paftadanRead from the drawing: area and perimeter are computed from the room polygon.
- mimarEntered or approved by the architect.
- düzenlendiChanged on site, with history kept.
- Sapma bildirIf a value does not match the site, one tap opens a revision request.
Revisions travel an approval chain to the architect
A request raised on site does not reach the architect without the site manager’s approval. Each step keeps its date and person; when the new sheet is uploaded the old one moves to history and the two can be overlaid.
- 1 Site raises it
- 2 Site manager approves
- 3 Architect answers
- 4 New version is issued
Mark finished areas on the drawing, Santix does the percentages
The crew draws the finished part over a room or marks the whole room. The percentage uses the right quantity for each work item and flows into the schedule and the project overview, so “how far along are we” is answered from the drawing, not a guess.
- Tiling, screed, parquetComputed from the room’s net floor area.
- Paint, plaster, wall finishesComputed from wall area with doors and windows deducted.
- Skirting and fixturesComputed from perimeter or a count.
- Photo evidenceEach progress mark can carry photos, recorded offline too.
- Feeds tasks and the GanttTask progress is the quantity- or cost-weighted sum of its rooms.
Santix computes the critical path
Tasks, dependencies (FS, SS, FF, SF with lag), milestones and total float. Gantt on iPad, a list on the phone. Import MS Project XML and Primavera P6 XER files.
Progress payments, line by line, with approvals
This period’s amount is cumulative work minus previous payments; retention, advance recovery, withholding tax, stamp duty and VAT withholding sit on separate lines. Above a threshold the owner must approve.
- Several currenciesTL, USD and EUR lines converted with the central bank (TCMB) rate of the date.
- Estimate from ExcelMatch the columns, confirm, and the budget lines are in.
- Who sees the budgetBy default the owner, site manager and project manager; switch per role or person.
Bids, contracts and documents in the same project
- Bid comparisonLine-by-line price, duration, payment term, guarantee; price weighted 60 % by default. The chosen bid goes to the budget.
- Contract templatesTemplates for 40 trades, missing details asked as questions, critical clauses flagged, key dates reminded. Not legal advice.
- Document trackingPermits, policies, bonds, inspection reports. Scan with the camera; number and expiry date are read for you to confirm.
Works in the basement, everyone sees their own
Records entered without a connection wait on the device and go when it returns. Permissions are enforced in the database at row level: a subcontractor never sees another firm’s bid, a field engineer never sees the budget.
| Module | Patron | Proje müd. | Şantiye şefi | Saha müh. | Mimar | Taşeron |
|---|---|---|---|---|---|---|
| Bütçe ve hakediş | A | R/W | R/W | – | – | – |
| Sözleşmeler | A | W | R/W | – | – | kendi |
| Paftalar | A | W | W | R + pin | W | R |
| Revize onayı | – | – | A | açar | cevaplar | – |
| İş programı | A | W | W | W | R | kendi |
| Evrak | A | W | W | W | R | kendi |
Invite codes, budget visibility and approved suggestions
- Invite codes8 characters, valid 14 days, single use. The code carries the role and the subcontractor’s firm; seats are enforced in the database.
- Budget visibilityNone, summary or full for each role. By default the owner, project manager and site manager see everything.
- NotificationsAssignments, pin status, revision steps, payments awaiting approval and document expiry go only to the people concerned.
- AI suggestionsLayer classification, room schedule matching, Excel columns, document reading, contract help and bid summaries. You approve; no drawing geometry is sent.
Every role in one project, with its own permissions
Santix is written for construction firms that work with subcontractors: residential and commercial contractors, project management firms, and their architects and subcontractors. Each role sees only the sections open to it.
- K-502Santix for site managers: site walks, snag lists and revision approvals in one appSite walk, snag list, revision approval, progress and payment checks: what a site manager sees in Santix, which screens they use and what they approve.
- K-501Santix for project managers: schedule, procurement, contracts and budget in one projectIn Santix the project manager builds the schedule and critical path, collects bids, drafts contracts and follows the budget. The week, screens and permissions.
- K-503Santix for architects: revision requests, new versions and room data approvalIn Santix the architect publishes drawing versions, answers revision requests and approves rooms and finishes. Budget and contracts are hidden from architects.
- K-504Santix for subcontractors: only the work assigned to you, only your contractIn Santix a subcontractor sees only tasks assigned to them, their own contract and documents, and reports finished work with a photo. Day, screens and limits.
- K-505Santix for company owners: budget, approvals and subscription in one placeBudget summary, payment approval threshold, document expiry, budget visibility, seats and subscription: what a construction firm owner sees in Santix.
What is ready today, and what is not
When choosing site software, knowing what it does not do matters as much as what it does. Where things stand today:
- ReadyDrawings, pins, room data, revisions, progress, schedule, payments and budget, purchasing, 40 contract templates, documents, team, offline work.
- Early accessComing soon to the App Store; for now through TestFlight. Android is in preparation.
- Not yetWeb price research, e-signature, an English app interface, a web version of the field app.
- Does not replaceThe statutory electronic site diary (Şantiye-M), accounting and e-invoicing, timesheets and payroll, warehouse stock.
- Legal noteContract templates are awaiting legal review and are not legal advice; have them checked before signing.
- DataStored in Frankfurt (EU), drawings processed in Frankfurt. No ads, tracking or location collection.
Monthly per organisation, by number of users
Every active user, including architects and subcontractors, is a seat. New organisations get a 3-day trial; afterwards nothing is deleted, the account becomes read-only. For annual plans and teams over 50, contact us.
Guides for the site
From progress-payment deductions to room schedules, critical path and document validity: worked examples with sources.
- R-01How to prepare a hakediş (progress payment) in TürkiyeA step-by-step guide to the Turkish hakediş: measurement, cumulative billing, retention, withholding tax, stamp duty and VAT withholding, with a worked example.
- R-02How to keep a daily site reportWhat a Turkish daily site report should contain, how to write entries that hold up later, and how it differs from the statutory Şantiye-M site diary.
- R-03The mahal listesi: how to prepare a room scheduleWhat a Turkish mahal listesi (room and finish schedule) contains, how rooms are coded, and how floor, wall and skirting quantities are derived from it.
- R-04How to manage drawing revisions on a construction siteHow Turkish sites manage drawing revisions: a revision log template, naming, when a permit amendment is needed, removing superseded sheets and a 6-step flow.
- R-05How to build a construction schedule and find the critical pathBuild a construction schedule in 5 steps and find the critical path, with a worked 10-activity foundation example, float and Turkish public works rules.
- R-06Documents a construction site in Türkiye must keep, and how long they lastDocuments a Turkish construction site must keep, with validity periods: building permit, risk assessment, safety training, scaffold and crane inspections.
- R-07How to do a quantity take-off (metraj): floors, walls, openings and recordsQuantity take-off step by step: floor, wall, ceiling and skirting quantities, deducting doors and windows, concrete and rebar, with worked room examples.
- R-08How to build a bid comparison table: one estimate, one set of rules, a reasoned decisionCollect subcontractor bids against one estimate, check unit prices and totals, and decide with a weighted score. A worked example with three bids.
- R-09Subcontract checklist: 20 points to check before you signWhat to check in a Turkish subcontract before signing: scope, price, advance, retention, delay penalty and cap, social security, taxes, acceptance and termination.
- R-10Turkish construction glossary: 81 terms from drawings to payments81 Turkish construction terms explained in English: hakediş, metraj, ataşman, keşif, poz, mahal listesi, pafta, kritik yol, teminat, stopaj and more.
Frequently asked questions
Which devices does Santix run on?
iPhone and iPad. Wide views such as the Gantt chart and side-by-side panels open on iPad; the phone shows the same data as lists. An Android version is in preparation. The interface is in Turkish.
Which files can I upload?
DWG, DXF and PDF for drawings; MS Project XML and Primavera P6 XER for schedules; Excel for cost estimates. DWG and DXF files are split into sheets on Santix’s own server.
Does it work on a site without internet?
Yes. Notes, photos and progress entered offline stay on the device and are sent automatically when the connection returns. Download a project in advance and its drawings open offline too.
How is the price calculated?
Per organisation, by number of users: 5 users 4.999 ₺, 10 users 8.999 ₺, 25 users 19.999 ₺, 50 users 34.999 ₺ a month, VAT included. Every active user, including architects and subcontractors, is a seat. New organisations get a 3-day trial.
Does a subcontractor see everything?
No. Subcontractors see only items assigned to them, their own contract and their own documents. Budgets, payment amounts and other firms’ bids are visible only to people you authorise.
How do I add my team?
In the project’s team section, pick a role and create an 8-character invite code to share by WhatsApp, SMS or email. Codes are valid for 14 days and work once; the person joins the right project with the right role.
Can I bring my existing schedule and estimate?
Yes. Schedules import from MS Project XML or Primavera P6 XER. An Excel estimate goes into the budget and a price list into a purchase request; Santix suggests the column mapping and you confirm it.
What does the AI do with my data?
It prepares suggestions in six places only: layer classification, room schedule matching, Excel columns, document reading, contract help and bid summaries. Nothing is saved without approval, no drawing geometry is sent, and OpenAI is asked not to store requests.
Which deductions does the progress payment include?
Retention, advance recovery, delay penalties, income tax withholding, stamp duty and VAT withholding sit on separate lines, then VAT is added. The calculation is cumulative: this period is total work to date minus previous payments.
Does Santix replace the site diary or accounting software?
No. The statutory electronic site diary (Şantiye-M) and accounting stay separate. Santix records site work, photos, approvals and payments; it does not issue invoices.
Let’s try it with one of your drawings
Send us a drawing and your cost estimate; try Santix on your own project through TestFlight early access. We help with setup and migration.