- Check "does it understand context" before speed — a tool that explains what the text means in this sentence is what actually saves time
- Interruption is about interaction: inline overlay > popup > window switch > opening a browser tab
- Answer length should be adjustable: if one sentence is enough, you shouldn't have to read three paragraphs
- Prefer local, disable-able history
- For pricing, ask whether credits expire and whether there's a BYO-key escape hatch
The short answer
The best way to look up words on a Mac in 2026 is a menu bar tool that explains the selection in context, right where you're reading — not a dictionary, not a browser tab, not a chatbot window. The built-in macOS dictionary is fine for plain definitions; anything beyond that (terms, jargon, polysemy, tone) needs context awareness.
The five criteria
1. Context awareness beats raw speed
Every option on this list is "fast enough". The real divider: does it tell you what the word means here? "shim" in programming docs is not a thin wedge; "attention" in an ML paper is not noticing. Tools that read the surrounding paragraph and answer "what it means in this context" eliminate the second round of googling entirely.
2. Interruption cost is the hidden tax
Ranking by how much of your reading flow survives the lookup:
- Inline overlay next to the selection (menu bar tools like PopGloss) — you never leave the sentence
- Popup panel (PopClip extensions, Easydict) — small context switch, same window
- Separate window (dictionary apps) — you leave the document
- Browser tab / chatbot — full context switch; this is where reading sessions go to die
3. Length control
A one-sentence answer is enough most of the time. Look for adjustable lengths (short / medium / detailed). Being served a 3-paragraph essay for a two-word phrase is its own kind of interruption.
4. History privacy
Lookup history is a reading diary. Prefer tools that store it in a local database, never upload it, and let you turn recording off entirely.
5. Predictable pricing
- Free tiers: the macOS dictionary (fast, but definitions only)
- Subscriptions: most AI tools — fine if you're heavy daily, wasteful if you're not
- Pay-per-use with permanent credits: e.g. PopGloss sells 1,000 credits for $10, never expiring; cost per explanation = model tier × answer length, cache hits and failed requests cost 0
Comparison table
| Approach | Context-aware | Interruption | Length control | History | Pricing |
|---|---|---|---|---|---|
| macOS dictionary | No | None | No | None | Free |
| Chatbot window | Yes (if you paste context) | High | Manual prompt | Cloud | Subscription |
| PopClip extension | Depends on extension | Low | Rarely | Rarely | Varies |
| Easydict / Bob | Translation-first | Low | Partial | Local | Free / paid |
| PopGloss | Yes (auto-grabs context) | Lowest (inline bubble) | 3 lengths | Local SQLite, off-switch | $10 = 1,000 credits, never expire |
Who should pick what
- Occasional lookups, plain definitions: the built-in dictionary is enough.
- Heavy translation work: a translation-first tool (Bob, Easydict) fits better — PopGloss is deliberately not a translator.
- Reading papers, docs, and books in a second language: a context-aware menu bar tool. That's the workflow PopGloss is built for.
Try it on your own reading: Download PopGloss — 10 free credits included, no account required.