Runs entirely on your Mac. Deterministic. Yours to keep.

Offline developer tools that open fast.

Paste a JWT, a hash, or a blob of JSON, and the right tool is already open.

On-device Deterministic Free download

macOS 14+ · Apple silicon & Intel · native Swift 6 / SwiftUI

01 · INDEX

One window. Whatever you copied, already open.

The stuff you keep re‑Googling at 2am, grouped the way you think about it. Plus the dozen‑plus everyday utilities you already reach for.

Encoding

Formatting

Generators

Crypto

Hash Generator MD5 · SHA‑1 · SHA‑256 · SHA‑512
JWT Decoder Pro

Converters

02 · METHOD

Smart where it counts. Quiet everywhere else.

A small rule-based check reads your clipboard and picks a tool. It runs on your Mac, so your clipboard stays with you.

Smart Detection routing copied content to the right tool: a JWT opens the JWT Decoder, a JSON snippet opens the JSON Formatter, a hex color opens the Color Converter, and a Unix timestamp opens Timestamp. Rule-based checks run on your Mac.

Paste →

eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.eyJzdWIiOiIxMjM0NTY3ODkwIiwibmFtZSI6Ik5ldmVyIGdvbm5hIGdpdmUgeW91IHVwIiwiaWF0IjoxNzYwMDAwMDAwfQ.fake_signature_for_demo_only

→ Bench renders

Header

{ "alg": "HS256", "typ": "JWT" }

Payload

{ "iat": 1760000000, "name": "Never gonna give you up", "sub": "1234567890" }

Signature (raw)

fake_signature_for_demo_only

Paste →

{"order_id":"8f3b","items":[{"sku":"BNCH-001","qty":2,"price":19.99},{"sku":"BNCH-PRO","qty":1,"price":14.99}],"customer":{"id":9001,"tier":"pro"},"total":42.99}

→ Bench renders

Output

{
  "order_id": "8f3b",
  "items": [
    {
      "sku": "BNCH-001",
      "qty": 2,
      "price": 19.99
    },
    {
      "sku": "BNCH-PRO",
      "qty": 1,
      "price": 14.99
    }
  ],
  "customer": {
    "id": 9001,
    "tier": "pro"
  },
  "total": 42.99
}

Paste →

ff8a3d

→ Bench renders

Hex

#FF8A3D

RGB

R255

G138

B61

HSL

H°23

S%100

L%62

SwiftUI

Color(red: 1.000, green: 0.541, blue: 0.239)

CSS

rgb(255, 138, 61)

Paste →

/order-(\d{4})-(paid|due)/i

→ Bench renders

Pattern

/order-(\d{4})-(paid|due)/i

Test string

invoice order-2847-paid synced · order-1930-due waiting

Matches

order-2847-paid @ 8-23

order-1930-due @ 33-47

\d{4} captures the order number. (paid|due) captures status.

Smart Paste

Paste a JWT. The decoder's already open.

Copy a chunk of JSON, switch to Bench, and the formatter is waiting. Copy a hex color, and the converter is open. Copy a JWT, and it's already decoded. Nothing to click.

The detection is regex and string checks. Maybe 200 lines. It's a rule‑based heuristic that runs entirely on your Mac. If it doesn't recognize what you pasted it just gives up quietly and lets you pick.

# bench.manifest: what Bench does, and doesn't

network.client        : false    # sandbox entitlement
analytics             : none
telemetry             : none
account.required      : false
third_party.sdks      : []
detection.method      : rule_based_heuristic
data.leaves_device    : false
purchase.model        : one_time
subscription          : none

03 · SIGNATURE

Read a regex as a tree. Watch it match. Step the trace.

Most regex tools stop at green highlights. Bench parses your pattern into a labeled tree, so the explanation and the match come from the same hand‑built engine.

Regex Tester + Explainer

The regex you inherited, made legible.

Bench parses your pattern into a labeled tree so you can see what each group, quantifier, and class actually does. Matches highlight inline as you type, and you can step through the execution trace one move at a time.

It runs on a hand‑built engine, so the explanation and the match are computed together on your Mac as you type. If you have ever inherited a regex you were afraid to touch, this is the tool that makes it legible.

How it reads

Every token, explained.

Hover any token for a plain‑English explanation of what it matches and why it's there.

Step the NFA trace to see exactly why a match did (or didn't) happen, one move at a time.

04 · TOOLS

The tools you already reach for, without the tab.

JSON and JWT are the tools Bench recognizes the moment you copy them. Image Diff is the visual check that's awkward to do anywhere else.

JSON Formatter

Paste minified JSON, get it back indented and readable. Bench detects it the moment you copy it, so the formatted output is waiting before you ask. Spot the missing comma before you ship.

JWT Decoder

Decode a token into its header, claims, and signature on your Mac. Copy a JWT, switch to Bench, and read it. The token stays on your machine, so credentials you control stay under your control.

Image Diff

Drop in two versions of a screenshot or asset and see exactly what changed: pixel differences surfaced side by side. The visual check that's awkward to do anywhere else.

Plus a dozen more everyday utilities (Base64, URL and text‑case encoders, hashes, timestamp, color, and number‑base converters, Markdown preview, and text diff), each detected and routed the same way.

05 · THE TOOLS IN USE

Native Swift 6 / SwiftUI, built on the current Apple stack.

Regex tester and explainer: token-highlighted pattern, hover explanations, inline match highlights, and a step-by-step execution trace

Read a regex as a tree, watch matches light up, step the trace. bench-03 · Regex Tester & Explainer

JSON formatter with pasted payload and formatted output

Paste minified JSON, get it back indented. bench-01 · JSON Formatter

JWT decoder with header, payload and signature panels

Paste a JWT, get the claims. bench-02 · JWT Decoder

Hash generator producing MD5, SHA-1, SHA-256 and SHA-512

Paste text, pick an algorithm, copy the hash. bench-04 · Hash Generator

Generate a UUID (or a hundred), copy, done. bench-05 · UUID Generator

06 · BUILD

Built to belong on a Mac.

Platform

macOS 14+

SwiftUI, native window

Architecture

Universal

Apple silicon & Intel

Tools

Counted exactly

Network use

None, per tool

No URLSession in source

Analytics

Zero

Just Apple frameworks

Accounts

Not required

Download, open, use.

Purchase

Free download

$14.99 Pro unlock

Distribution

Mac App Store

Sandboxed, notarized

Requires macOS 14 or later · Apple silicon or Intel · Universal binary

07 · PRICING

Free download. Pro when you need it.

Bench has been submitted to the Mac App Store. Core tools are included; Bench Pro is an optional one-time unlock for Smart Detection, Pro tools, and higher limits.

Bench Pro unlock

$14.99

USD · optional in-app purchase

Free download with core tools included
Unlocks Smart Detection and every Pro tool
Raises input limits for large payloads

Get notified

Prices in USD. The App Store shows the final Pro unlock price for your region.

Bench has been submitted to the Mac App Store.

Once available, Bench is free to download. Bench Pro is an optional $14.99 one-time unlock for Smart Detection, Pro tools, and higher input limits.

→ Free download with core tools included

→ Bench Pro unlocks Smart Detection and Pro tools

→ $14.99 one-time, no subscription

08 · FAQ

Questions you might ask before buying.

If yours isn't here, email [email protected]. Every message is read by a human.

Does it work offline?

Yes. Every tool runs entirely on your Mac. No tool in Bench makes network calls. The exceptions are Apple's App Store download and Pro purchase/restore flows, which are handled by macOS itself and use the network to talk to Apple, not to us.

Is the "smart" part AI?

No. It's rule‑based pattern matching: regex and string checks tuned per format, with no model involved. That's why it's instant and deterministic, and the work happens entirely on your Mac.

How much is Bench, and what do I get?

Bench is free to download. Bench Pro is an optional $14.99 one-time in-app purchase that unlocks Smart Detection, Pro tools, and higher input limits.

Does it sync between my Macs?

No. Bench keeps everything local on the Mac you're using. There are no accounts, no servers to sign into, and nothing is sent anywhere for you to sync against. If you want your recent inputs on another Mac, copy and paste them.

Is it a universal binary?

Yes. Bench ships as a universal binary that runs natively on Apple silicon and Intel Macs. The minimum system requirement is macOS 14.

What data does Bench collect?

None. Bench has no account system and carries no analytics or third‑party SDKs. Smart Paste reads your clipboard locally to pick a tool; the detection is a rule‑based heuristic that runs on your device. Whatever you type, paste, or generate stays on your Mac.

How do updates work?

Once Bench ships, updates will arrive through Apple the same way as any Mac app you install from the store. You won't need to do anything special; macOS handles the install when an update is available.

Can I get a refund?

Once the app ships, purchases and refunds will be handled by Apple. You'll be able to request a refund from Apple directly via reportaproblem.apple.com. If something in the app isn't behaving, email [email protected] first. There's a good chance it's a fixable bug.