Zeplin is the broader, more established design and prototyping tool and wins for teams that want depth, integrations, and a mature ecosystem. Principle is the more focused alternative that trades breadth for a simpler, more specialized experience. If you need maximum capability and ecosystem, choose Zeplin; if a leaner, more focused tool fits your team, Principle is worth a close look.
Quick comparison
| Feature | Zeplin | Principle |
|---|---|---|
| Starting price | Free plan | $129/mo |
| Free plan | Yes | No |
| Open source | No | No |
| Self-hostable | No | No |
| G2 rating | Not listed | Not listed |
| Best for | product and UI designers wanting a mature, full-featured design and prototyping tool | product and UI designers wanting a focused, simpler design and prototyping tool |
| Starting price | Zeplin offers a free plan. | Principle starts around $129/user/month. |
| Free plan | Yes | No |
| Open source | No | No |
| Self-hostable | No | No |
| Primary tradeoff | Zeplin fits best when its default workflow already matches the team, while Principle is stronger when its focus maps more closely to the work being managed. | Principle fits best when its default workflow already matches the team, while Zeplin is stronger when its focus maps more closely to the work being managed. |
| Best for | product and UI designers wanting a mature, full-featured design and prototyping tool | product and UI designers wanting a focused, simpler design and prototyping tool |
Design and prototyping
Zeplin is design handoff for engineers; Principle is animated interaction design for Mac. On raw capability and feature depth, Zeplin is the stronger of the two — it covers more of the design and prototyping tool workflow out of the box and handles edge cases that Principle only reaches through workarounds or add-ons. Principle keeps a deliberately narrower surface area, which is a feature for teams that find broader tools cluttered. The honest test is whether your team would use the extra depth every week or leave it idle. Map your three most common design and prototyping tool tasks against each product before deciding, because feature lists rarely predict daily fit.
Ease of use
For everyday usability and onboarding, Principle is the easier of the two to live with. Principle gets a team to first value with less configuration, while Zeplin asks for more upfront structure and setup. Both Zeplin and Principle reward teams that adopt their default workflow rather than fighting it. Adoption is where most design and prototyping tool rollouts succeed or stall, so weigh who opens the tool every day — and how much training they will tolerate — more heavily than any single capability. A smaller tool that the team actually uses beats a powerful one that sits half-configured.
Collaboration and handoff
Neither Zeplin nor Principle is open source, so control comes down to data export, portability, and how much you depend on each vendor's roadmap. Zeplin offers more depth here through richer admin settings, export options, and APIs, while Principle keeps things simpler at the cost of some configurability. If avoiding lock-in is a priority, confirm both products' export formats and API limits before you store years of design and prototyping tool data in either one. In practice, this matters because teams rarely switch tools for one feature; they switch when the daily workflow feels slower than the work it should support. Test one real use case in each before committing.
Pricing and value
On price, Zeplin is the better value for most teams. Zeplin offers a free plan; Principle starts around $129/user/month. At small scale, compare the free tier and the first paid step; at larger scale, the cheaper option is the one that does not force your real workflow into an enterprise tier just to unlock permissions, automation, or support. Principle can still win on total cost if it replaces other tools you already pay for, so price the whole stack, not just the per-seat sticker. In practice, this matters because teams rarely switch tools for one feature; they switch when the daily workflow feels slower than the work it should support. Test one real use case in each before committing.
Plugins and ecosystem
Zeplin has the broader ecosystem — more native integrations, a larger community, and more templates, guides, and people who already know it. Principle connects to the common tools but leans on a smaller marketplace for anything niche. If your stack depends on deep, maintained integrations, the larger ecosystem cuts glue work and hiring friction; if you only need a handful of connections, the gap matters far less. Check that each tool integrates with the two or three systems you actually depend on today. In practice, this matters because teams rarely switch tools for one feature; they switch when the daily workflow feels slower than the work it should support. Test one real use case in each before committing.
Pricing deep-dive
Zeplin
- Free plan: $0 — covers core design and prototyping tool use with limits on seats, usage, or history.
- Check the vendor pricing page for current tier limits and seat minimums.
Principle
- Paid plans start around $129/user/month (billed annually); higher tiers add automation, admin controls, and scale.
- Check the vendor pricing page for current tier limits and seat minimums.
Pricing verdict: Zeplin offers a free plan; Principle starts around $129/user/month. Zeplin has a free plan and Principle has no free plan. For most teams Zeplin is the lower-cost choice on the entry tiers. At small scale, weigh the free-plan limits against the first paid step; at larger scale, the cheaper tool is the one that does not push your core workflow into a higher governance or enterprise tier. Always confirm current pricing on each vendor's page before you commit.
How to migrate from Zeplin to Principle
What real users say
Zeplin: Zeplin users praise its fit for product and UI designers wanting a mature, full-featured design and prototyping tool, and most complaints center on price at scale or features they do not need.
Principle: Principle users praise its fit for product and UI designers wanting a focused, simpler design and prototyping tool, and most complaints center on gaps in depth, integrations, or polish versus the larger incumbent.
Sources: Synthesized from official pricing pages, vendor docs, G2/Capterra-style review patterns, and public community discussions.
Final verdict
Choose Zeplin if...
- Choose Zeplin if you want the broader, more capable option and the team will use it as the primary design and prototyping tool.
- Choose Zeplin if mature integrations, community, and available expertise matter more than squeezing the lowest price.
- Choose Zeplin if its workflow already resembles how your team works, keeping switching and training costs low.
Choose Principle if...
- Choose Principle if you want a leaner, more focused tool rather than bending Zeplin to fit.
- Choose Principle if a leaner, more focused tool would see better day-to-day adoption than a broader platform.
- Choose Principle if its strengths line up with your top design and prototyping tool workflow instead of forcing the team into the wrong defaults.
Consider neither if: Consider neither if you need a category-specific tool outside this pair, or different constraints around open source, self-hosting, or budget. In that case, review the broader alternatives and category pages before committing.