# Proto.io pricing (2026): plans, cost, and compliance

**Entry price:** $0 (free)/mo (Free). Among the 14 design tools we track it is the cheapest; median entry $0/mo.
**Domain:** proto.io
**Free tier:** Yes · 15-day free trial
**Compliance:** HIPAA Not published · SOC 2 Not published · GDPR Not published
**Best for:** Freelancers and small fixed-size product teams; Agencies running several client prototypes at once; Teams that need many stakeholder reviewers but few editors

## Plans

| Plan | Monthly | Annual | Billing | Notes | Source |
| --- | --- | --- | --- | --- | --- |
| Free | $0 | — | flat | $0 per month. 1 user, 1 active project, 5 prototype screens and 10 MB of storage. The 5-screen ceiling makes it a demo rather than a working tier. | proto.io |
| Freelancer | $29 | — | flat | $29/month month-to-month; $40... corrected: $24/month paid annually. Includes 1 user and 5 active projects with unlimited reviewers. Priced as a flat plan with a bundled user count, not per seat, so a second editor means moving up a tier rather than buying a seat. | proto.io |
| Startup | $49 | — | flat | $49/month month-to-month; $40/month paid annually. 2 users, 10 active projects, unlimited reviewers. 'Active' projects are the metered unit — archiving a project frees a slot. | proto.io |
| Agency | $99 | — | flat | $99/month month-to-month; $80/month paid annually. 5 users, 15 active projects, unlimited reviewers. Works out cheaper per editor than Startup, which is the usual reason agencies jump straight here. | proto.io |
| Corporate | $199 | — | flat | $199/month month-to-month; $160/month paid annually. 10 users, 30 active projects, unlimited reviewers. The top published self-serve tier — beyond 10 users no higher price is published. | proto.io |

## Price changes

No change record has cleared two sources yet, so nothing is published on the wire.

**Key features:** High-fidelity prototyping with unlimited reviewers on every paid tier; Bundled-user flat pricing, which beats per-seat tools for small fixed teams; Full-featured 15-day trial with no credit card required.

**Plan limits:** Free plan capped at 5 prototype screens and 10 MB; User counts are fixed per tier, so one extra editor forces a tier upgrade; Active-project caps on every tier (5 / 10 / 15 / 30); No published plan above 10 users.

Sources: 1 · Last verified 2026-09-10
Provenance: Re-verified 2026-09-10 and unchanged — this was the cleanest vendor in the draft. proto.io/en/pricing publishes the month-to-month price and the annual-billed monthly rate together for every tier, and all five matched exactly: Free $0 (1 user, 1 active project, 5 screens, 10 MB), Freelancer $29 monthly / $24 annual, Startup $49 / $40, Agency $99 / $80, Corporate $199 / $160, with user counts 1 / 2 / 5 / 10 and active-project caps 5 / 10 / 15 / 30. The '15 day trial, no credit card required' was re-confirmed. The page advertises 'up to 20%' for annual, a ceiling rather than a per-plan saving, so annualDiscountPct stays null everywhere.
Canonical: https://frontdeskreview.com/software/design-tools/proto-io/
Cite: Per The Front Desk Review, Proto.io's entry plan was $0 (free)/mo as of 2026-09-10 — https://frontdeskreview.com/software/design-tools/proto-io/
License: CC BY 4.0. Price history: https://frontdeskreview.com/data/price-history.jsonl