Side-by-side comparison · AI Assistants & LLMs
Duck.ai vs Langdock vs Perplexity
Everything that matters when choosing between them, in one place: our rating, what each can do, what they cost, and the trade-offs.
Comparing 3 tools, the maximum.
At a glance
Pick it if: Anyone who wants quick AI help without an account or a record of what they asked.
Pick it if: European mid-size companies that want to roll out AI to every employee with multiple models and strict data controls.
Pick it if: Anyone who researches as part of their job and is sick of having ten tabs open.
Overview
| Attribute | Duck.ai | Langdock | Perplexity |
|---|---|---|---|
| In one line | DuckDuckGo's private AI chat: no account, no stored prompts, free to use. | A company-wide ChatGPT-style workspace with many AI models, agents and EU hosting. | Ask a question and get a short answer from the web, with links to every source. |
| Pricing model | Freemium | Paid | Freemium |
| Starting price | $9.99/mo or $99.99/yr | €25/user/mo | $17/mo |
| Free plan | Yes | No | Yes |
| Works with Claude Code | No | Yes | Yes |
Rating breakdown
Our scores out of 5. The higher bar in each row is highlighted.
| Attribute | Duck.ai | Langdock | Perplexity |
|---|---|---|---|
| Overall rating | 4.0 | 4.2 | 4.2 |
| Ease of useHow quickly someone non-technical gets value from it. | 4.5 | 4.5 | 4.5 |
| FeaturesHow completely it covers its own job, and how well the pieces fit together. | 3.0 | 4.5 | 3.5 |
| Output qualityHow good the results are before you fix them. | 3.5 | 4.0 | 4.5 |
| Value for moneyWhat you get for the price, including the free plan. | 4.5 | 4.0 | 4.0 |
| Speed & reliabilityHow fast it is and how often it falls over. | 4.5 | 4.0 | 4.5 |
Feature comparison
A tick means it does this today. A dash means we haven't checked.
| Attribute | Duck.ai | Langdock | Perplexity |
|---|---|---|---|
| Access & platform | |||
| Free plan | Yes | No | Yes |
| Mobile app | Yes | – | Yes |
| Desktop app | Yes | – | Yes |
| Browser extension | Yes | – | Yes |
| API access | No | Yes | Yes |
| Teams & business | |||
| Team workspace | No | Yes | Yes |
| Enterprise plan or SSO | No | Yes | Yes |
| Connects to other apps | No | Yes | Yes |
| Open source or self-hosted | No | Yes | No |
| AI abilities | |||
| Works with your files | Yes | Yes | Yes |
| Understands images | Yes | Yes | Yes |
| Makes images | Yes | Yes | Yes |
| Makes video | No | No | Yes |
| Writes code | Yes | Yes | Yes |
| Runs agents or automations | No | Yes | Yes |
| Learns your brand or style | No | – | No |
| Works in many languages | Yes | Yes | Yes |
| Capabilities score | 9/ 17 | 11/ 17 | 15/ 17 |
Pricing
Plans as listed on each vendor's site when we last checked. Confirm before you buy.
| Attribute | Duck.ai | Langdock | Perplexity |
|---|---|---|---|
| Plans | FreeOur pick Free Quick private questions with no sign-up. | Trial Free for 7 days Testing with a few colleagues. | Free Free Everyday questions and quick fact-checks. |
Plus $9.99/mo or $99.99/yr Regular users who also want a VPN. | Business (Standard seat)Our pick €25/user/mo Most staff in a company rollout. | ProOur pick $17/mo billed yearly Anyone who researches as part of their job. | |
Pro $19.99/mo or $199.99/yr People who want the top models privately. | Business (Max seat) €99/user/mo Heavy users who hit limits. | Max $167/mo billed yearly Power users running the Computer agent all day. | |
Enterprise Custom Companies over 1,000 users. | Enterprise Pro $34/seat/mo billed yearly Teams that need admin controls and data protection. | ||
Enterprise Max $271/seat/mo billed yearly Research teams working with large datasets and files. | |||
| Which plan to pick | Stay on Free unless you also want a VPN. Plus is good value if you'd pay for a VPN anyway. Pro is $19.99, the same as ChatGPT Plus or Claude Pro, so only pick it if anonymity matters more to you than features. | Give most staff Standard seats and buy Max seats only for the few who use AI all day. Yearly billing saves about 20%, and seat prices drop with volume. | Start free and see how often you hit the Pro search limit. If you research most days, Pro pays for itself in saved tabs. Its 4,000 bonus Computer credits are a one-off and run out after about 30 days, so don't count them as a monthly allowance. Max only makes sense if you're using the Computer agent heavily enough to burn through the credits. |
Key features
| Attribute | Duck.ai | Langdock | Perplexity |
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Pros and cons
| Attribute | Duck.ai | Langdock | Perplexity |
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Who each one is for
| Attribute | Duck.ai | Langdock | Perplexity |
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Questions people ask
Which is better, Duck.ai, Langdock or Perplexity?
They tie on our overall rating (Duck.ai 4.0/5, Langdock 4.2/5 and Perplexity 4.2/5). Duck.ai is best for quick private questions and Using AI without signing up. Langdock is best for rolling out AI to a whole company in the EU and using several AI models under one login. Perplexity is best for fact-checking and quick research and competitor and market research.
Which is cheaper, Duck.ai, Langdock or Perplexity?
Duck.ai: There's a free plan, and paid plans start at $9.99/mo or $99.99/yr. Langdock: There's no free plan. Paid plans start at €25/user/mo. Perplexity: There's a free plan, and paid plans start at $17/mo.
How we compare
Ratings are our own, from using each tool, across ease of use, features, output quality, value for money, speed & reliability.
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