SUBTILLIS

FOR ARCHITECTS & ENGINEERS

You speak Revit.Everyone else speaks PDF.

Subtillis is the translator. One tracked record of your drawings, specs, RFIs, and submittals, with AI on the drudgery: the digging, the checking, the drafting. If something better than AI existed, we'd bring you that instead.

CH. 01

Where AI helps (and where it doesn't)

If we could do this without AI, we would. Nothing else reads everything and forgets nothing. Reading is its job. Judgment is yours.

GOOD AT, TODAY

  • +Reading a full set: every sheet, schedule, spec
  • +Cross-checking tags, schedules, and code refs
  • +Answering “where is that detail” in seconds
  • +Drafting RFI responses from the record

NOT GOOD AT

  • Design judgment: it flags, you decide
  • Stamping, or carrying liability
  • Documents it can't see
  • Being trusted blindly: every flag cites its source
CH. 02

It starts with the record

AI can only check what it can read. Everything starts with one tracked record.

PROJECT RECORDDRAWINGS · SPECS · RFIS · SUBMITTALSFIND THE ANSWERany sheet, any specCATCH ERRORSclashes, refs, code citesANSWER RFISdrafted from the recordPROVE WHAT CHANGEDevery rev, every authorCLEAR SUBMITTALSfirst pass in minutesMARK UP + STAMPin the record, not a copy

EACH SPOKE FEEDS THE RECORD. THE RECORD FEEDS EVERY SPOKE.

CH. 03

Checking a drawing set

It reads the whole set, then sweeps every sheet. Every finding cites the sheets that prove it. Watch it run.

REVIEWA-201 · Level 2 Floor Plan · Rev C
123ABD-14D-12B-3M-2OFFICE 214CORRIDOR 210FINISH PER SPEC 09 91 23 (ASTM D16-14)NSCALE: 1/8" = 1'-0"
1
2
3

PRODUCT ILLUSTRATION · PLACEHOLDER PROJECT

CH. 04

Proving what changed

The three findings from chapter 03 come back fixed in Rev D: clouded, logged, and attributed. When the question arrives years later, the answer is one lookup, not an afternoon of overlays.

COMPAREA-201 · Level 2 Floor Plan
B-3OFFICE 214CORRIDOR 210D-14M-2FINISH PER SPEC 09 91 23 (ASTM D16-14)D-14DM-2DFINISH PER SPEC 09 91 23 (ASTM D16-19)D
3 CHANGES · REV C → REV D · ISSUED 2026-07-31EVERY DELTA CLOUDED AND LOGGED
  • Δ1Duct M-2 rerouted east of grid 2

    Clears beam B-3. Was 4" clearance, spec requires 8".

    M-102 · S-301

  • Δ2Door D-14 relocated 5'-0" north

    Door schedule A-601 updated to match.

    A-201 · A-601

  • Δ3Finish note updated to ASTM D16-19

    D16-14 superseded in the current code cycle.

    SPEC 09 91 23

CH. 05

The paperwork that follows you

A set is finished once. Its paperwork runs for years, and it starts arriving long after the project has left everyone's head.

COST TO FIX THE SAME ERROR0×DESIGN0×PERMIT0×CONSTRUCTION0×YEARS AFTERSUBTILLIS WORKS HERE
RFI LOGRFI 047 · W12 connection at grid 2-B
FROM THE FIELD · TUE 08:14INCOMING

Detail 5/S-501 is referenced on S-201 but appears to have been removed in the current set. Confirm the governing detail for the W12 connection at grid 2-B.

CONSTRUCTION STARTED 14 MONTHS AFTER THE SET WAS ISSUED

DRAFT RESPONSE · FROM THE RECORDDRAFT

S-201 REV DS-502 DET 7REV LOG C→D
SEARCHING THE RECORD…

RFIs

Logged, sheets attached, response drafted.

Submittals

First-pass check against your own specs.

Markup & stamps

In the record, not a duplicate PDF.

CH. 06

Adopting it without betting the firm

Treat AI like any new sub or material: a small controlled trial with a number at the end.

STEP 1

Pick one project

Live, mid-size. Set up in a day.

STEP 2

Measure what it catches

Before your process would have.

STEP 3

Decide with numbers

No case for project two? Stop. Cheap answer.

MEASURING WITH PILOT FIRMS NOW. REAL NUMBERS WILL BE PUBLISHED HERE.

APPENDIX A: YOUR DATA

Skepticism is healthy.

Your documents stay yours

Encrypted, exportable anytime.

No training on your data

Contractual, not a toggle.

Access you control

Per-project permissions, full audit log.

Audited, in writing

SOC 2 Type II in progress.

APPENDIX B: THE SLOPE

Judge us by the slope.

We ship every week. This page is the receipt.

SHIPPED RECENTLY

  • JUL 17Clash detection across overlaid structural and mechanical sheets
  • JUL 10Plain-language search across drawings and spec sections
  • JUL 03Version diffs: see exactly what changed between Rev B and Rev C
  • JUN 26Procore sync (beta): RFIs land in your log automatically
  • JUN 19Bulk sheet upload with automatic title-block reading

COMING NEXT

  • · ·First-pass submittal review
  • · ·Newforma integration
  • · ·Stamped-set export
  • · ·Drawing-to-spec cross-check, round two

One record that speaks fluent PDF, so your engineers can stay in Revit. AI does the reading. They keep the judgment.

LAST SHEET

Join the waitlist.

Pilot slots are limited while we measure with the first firms. Tell us where the paperwork hurts and we will reply when a slot opens. One live project, set up in a day, findings inside the first week.

PREFER EMAIL? hello@subtillis.ai

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