Honest comparison
Tack vs MarkUp.io
MarkUp.io is one of the best-known visual feedback tools, popular with agencies annotating websites and images. Tack plays in the same space with a different center of gravity: flat solo-friendly pricing and sign-off as a certified, verifiable record rather than a checkmark.
MarkUp.io is best for
Larger agency teams already living in the Ceros ecosystem who mainly need annotation volume.
Tack is best for
Solo designers and small studios who want feedback AND a paper trail — at a flat $17.99 instead of ~$79/month team pricing (as of writing).
| Tack | MarkUp.io | |
|---|---|---|
| Price for one designer | ✓ $17.99/mo flat (free tier included) | ~$79/mo team-oriented pricing (as of writing) |
| Certified sign-off | ✓ Digitally signed PDF certificate: typed signature, consent, SHA-256 file fingerprints, public verification page | Approval status only — no signed certificate or evidence record |
| Client experience | One link, no account, works on phones; optional verified sign-in per link | Guest commenting via link |
| A/B decisions | ✓ Two variants, client must pick one and give a reason — logged like a sign-off | Not a first-class feature |
| Link security | Password (checked in the database), expiry date, instant revoke, private file storage with short-lived signed URLs | Varies by plan |
| Formats | Live-site snapshots, images, PDFs/decks, video timestamps, email templates, A/B tests | Websites, images, PDFs, video |
The honest verdict
If you bill clients as one person or a two-person studio, Tack gives you the same pinned-comment workflow plus certified sign-off for roughly a fifth of the price. If you're a 20-person agency standardized on Ceros, MarkUp remains a fine choice.
Competitor details reflect public information as of writing and may change — check their site for current pricing.