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Bundlephobia | Size of npm dependencies Review

Worth it

Should I use Bundlephobia | Size of npm dependencies?

Bundlephobia helps you find the performance impact of npm packages. Find the size of any javascript package and its effect on your frontend bundle. - bundlephobia.com

· 1 month ago

Any frontend developer should keep Bundlephobia open — it is free and instantly answers what a dependency costs your bundle before you install it. Skip it if you never ship frontend JavaScript; it does nothing else.

Confidence

Medium. Based on ~20 public sources; overwhelmingly recommendations and mentions, few critical reviews.

Ratings

  • Value for money
  • Ease of use
  • Feature depth
  • Support qualityNo support evidence in sources
  • Security posture

Pricing

$0

Free

ModelNot disclosed
Monthly feesNot disclosed
HardwareNot disclosed
Free tierYes

Best for

  • Frontend devs vetting npm packages pre-install
  • Teams fighting React bundle bloat
  • Library authors comparing package weight
  • Quick check-before-you-install habit

Not for

  • Backend/Node-only teams — no frontend bundle to weigh
  • Non-developers; it assumes you run npm installs
  • Teams needing CI-enforced bundle budgets
  • Anyone needing a full audit of their app's real bundle

Gotchas - check before you buy

medium

Checks packages in isolation; tree-shaking in your build may differ

low

No pricing page or support channel listed — treat it as free-as-is, no SLA

low

Site publishes no security page, so transparency is limited

Pros and cons

Pros

  • Free instant size check for any npm package
  • Named among '15 time-saving websites every developer needs'
  • Cited in academic research on JS library performance
  • Public API powers badges and benchmarks
  • Embedded in real company coding guidelines

Cons

  • Package lookups only; won't audit your app's actual bundle
  • No security page published on the site
  • Browser-only; some devs built in-editor alternatives for speed

Sources & method

- 8 sources - No known vulnerabilities found in the sources reviewed. Gridinsoft Trust Score 88/100 with no malware or phishing blacklist detections.

official x3review x2security x1news x2

Key stats

  • Value for money: 5/5

    Rating

  • $0

    Starting price

  • 8

    Sources

  • Analyzed

  • Value for money: 5/5. Free; there is nothing to pay
  • Ease of use: 5/5. Paste package name, get size
  • Feature depth: 3/5. Single-purpose size lookup only
  • Support quality. No support evidence in sources
  • Security posture: 4/5. 88/100 trust score, no blacklist detections
  • $0 Price Free public web tool
  • Yes Free tier Entire tool is free
  • 88/100 Trust score Gridinsoft scan, no blacklist hits
  • 2+ papers Academic citations 2022 thesis and JS framework survey

Pricing

Free

$0

  • Size any npm package
  • See frontend bundle impact

Security

No known vulnerabilities found in the sources reviewed.

Gridinsoft Trust Score 88/100 with no malware or phishing blacklist detections.

What users say

Developers and dev-content writers repeatedly recommend it as a pre-install habit; no substantive complaints surfaced in sources.

“Senior dev habit: Check bundle size before you install — not after production feels slow.”
LinkedIn, Attila Vago
“Great work on this tool Shubham Kanodia!”
LinkedIn, DebugBear
“В react-colorful я вообще собрал бенчмарк на основе бейджей, использующих API bundlephobia.com.”
Thread Reader App, @jsunderhood

Companies that use it

Full analysis

Based on ~20 public sources; overwhelmingly recommendations and mentions, few critical reviews.

Free, instant npm package size checks. Use before every install; useless if you don't ship frontend JS.

Methodology

Based on ~20 public sources; overwhelmingly recommendations and mentions, few critical reviews.

Read how a report is made.

Sources

  1. Bundlephobia official sitebundlephobia.com
    official
  2. Bundlephobia.com Safety Review (88/100 Trust Score)gridinsoft.com
    security
  3. 15 Time-Saving Websites Every Developer Needsjavascript.plainenglish.io
    news
  4. Utility Library Performance Compared to Native Solutions (2022 thesis)diva-portal.org
    review
  5. Banal: on-demand bundle analyzer for VSCodegithub.com
    official
  6. COMET DXP coding guidelines referencing Bundlephobiadocs.comet-dxp.com
    official
  7. Senior dev habit post (LinkedIn)linkedin.com
    news
  8. Upcoming JavaScript web frameworks survey citing Bundlephobiaresearchgate.net
    review

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