FlowManual vs STACK
Two takeoff-and-estimate tools that both offer a free way in. FlowManual (YC S26) links on-screen takeoff to an estimating workbook and runs a free plan with a daily usage allowance; STACK publishes per-user prices and offers a free version of Takeoff & Estimate. Pages read Oct 14-18, 2026; desk research, not tested, no winner.
DESK RESEARCH, NOT TESTED. Compiled from vendors' public websites (accessed FlowManual Oct 18, 2026; STACK Oct 14, 2026). Vendor claims are not verified by Means & Methods Lab. No scores or rankings.
In short: FlowManual (Takeoff linked to an estimating workbook, with a free plan; free option; paid prices not listed) vs STACK (Takeoff & estimating; vendor publishes prices). Facts last checked FlowManual Oct 18, 2026; STACK Oct 14, 2026. No winner declared; not tested.
Side by side
| Sheet row | FlowManual | STACK |
|---|---|---|
| Category | Takeoff linked to an estimating workbook, with a free plan | Takeoff & estimating |
| AI role (our label) | AI-first | AI features added to established product |
| What it does | Takeoff and estimating software that links quantities measured and counted on drawings to an estimating workbook with formulas, multiple sheets, rates and assemblies. The site (read Oct 18, 2026) lists takeoff workflows for mechanical (equipment counts, pipe runs), ductwork, concrete and general symbol counting; refreshing linked quantities when drawings change, with manual edits protected for review; scope review of specs and contracts for requirements and exclusions; drawing revision comparison; bid leveling of subcontractor proposals; and chat. Its YC profile calls it an all-in-one AI estimating, bidding and purchasing platform for general and MEP contractors. Security statements: AES-256 encryption at rest isolated per company, SSO, MFA and audit logging, and training on customer documents and pricing only with opt-in (vendor statements). Y Combinator batch: Summer 2026 (YC company profile). | Cloud-based construction software covering digital takeoff, estimating and proposals, and field/project management ("Build & Operate"). The vendor now describes STACK as an AI preconstruction platform: AI that reads uploaded sheets, auto-names pages, and flags revisions; AI auto-counting of symbols and suggestions of scope that may be missed; and AI described as pressure-testing pricing and flagging risk, gaps, and pricing drift in estimates. Unlimited viewer seats. |
| Who it's for | General and MEP contractors' estimators, from solo estimators on the free plan to teams. | Specialty contractors, general contractors, suppliers and manufacturers, owners and developers. |
| Pricing (as publicly stated) | Free plan with every feature inside a daily usage allowance, unlimited projects and uploads, no card required (flowmanual.com/pricing, read Oct 18, 2026). Pro is custom and sales-led, with unlimited usage and priority support. The page says symbol counts on drawing sets use far more of the allowance than reading a document, so counting a full set needs Pro or a trial. | Per-user subscription. Takeoff & Estimate $299/user/mo; Build & Operate $49/user/mo; full platform $348/user/mo. A free version of Takeoff & Estimate is offered; Build & Operate has a two-week free trial. (Pricing re-checked Oct 14, 2026.) |
| Test status | Not tested. No scores. | Not tested. No scores. |
| Vendor links | ||
| Sources |
Facts last checked: FlowManual Oct 18, 2026; STACK Oct 14, 2026. Prices change; check the vendor page before relying on them.
Where the vendor descriptions differ
- Pricing: FlowManual's free plan includes every feature within a daily allowance, with Pro custom and sales-led; its pricing page says counting symbols on a full drawing set needs Pro or a trial. STACK lists Takeoff & Estimate at $299 per user per month, Build & Operate at $49 and the full platform at $348, plus a free version of Takeoff & Estimate.
- Takeoff to estimate: FlowManual keeps quantities linked to a workbook with formulas, multiple sheets, rates and assemblies, and refreshes linked quantities when drawings change while protecting manual edits. STACK covers digital takeoff, estimating and proposals, plus field and project management in Build & Operate.
- AI features: FlowManual lists scope review of specs and contracts, drawing revision comparison, bid leveling and chat; its YC profile calls it an AI estimating, bidding and purchasing platform. STACK describes AI that reads uploaded sheets, auto-names pages and flags revisions, auto-counts symbols, suggests missed scope and flags pricing drift in estimates.
- Who each names: FlowManual says general and MEP contractors and lists mechanical, ductwork, concrete and general counting workflows. STACK names specialty and general contractors, suppliers and manufacturers, owners and developers.
Paraphrased from the sources listed above. Vendor claims are reported as claims.
What we can't tell you yet
Which tool is better for your work. That needs testing on the same package with a verified answer key. Planned measures for this comparison:
- How much takeoff fits in FlowManual's free daily allowance on a typical set
- What STACK's free Takeoff & Estimate version leaves out
- Count accuracy of either tool on your own drawings
See the methodology and leaderboard status.
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