Posthaste vs 3DaysDo
Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.
Posthaste
Easily address envelopes and print labels from your iPhone. Smart paste extracts address details, and a 3D preview ensures accurate placement. Supports various envelope and label sizes, with bulk import for sellers.
- Smart address pasting
- Print to any AirPrint printer
- Save as PDF
- Supports all common envelope sizes
- Supports various label sizes
- Bulk import for sellers
- 3D envelope preview
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Paste an address. Pick your envelope. Tap Print. Posthaste is the fastest way to address an envelope or sheet of labels from your iPhone. Smart paste figures out the name, street, city, and ZIP from anything you copy. Print to any AirPrint printer or save as PDF. One-time $1.99. No subscription, ever. Trading-card sellers — yes, Posthaste is the PWE printer you've been looking for. Bulk import a TCGplayer or eBay order screenshot and print every plain white envelope in one batch. EVERY ENVELOPE SIZE Print directly onto whatever you already have at home or at the office. • #6¾, #9, #10 (business standard) • A2, A6, A7, A9 (greeting & invitation) • 5×7, 6×9, 9×12 (photo & catalog) • Custom sizes for anything weird ALL THE STICKER SIZES YOU ACTUALLY USE For when you'd rather peel-and-stick onto a plain white envelope. • Single labels for Dymo, Brother, and thermal printers (¾×2½, 1×2, 1×4, 2×2, 2×4, 4×6 shipping, 4×8 large shipping) • Every Avery sheet template — 5160, 5161, 5162, 5163, 5164, 8163, 8164 — with per-cell selection so you only print the stickers you need • "Fill all" button for when you want every cell at once SMART PASTE THAT ACTUALLY WORKS Copy any address from anywhere — Mail, Messages, Notes, a website — and paste it into one box. Posthaste recognises the name, street, apartment, city, state, and ZIP and fills the fields below for you. Spelt-out state names get converted to USPS codes, "Avenue" gets shortened to "Ave", and missing ZIPs get flagged before you waste a stamp. 3D LIFELIKE PREVIEW The whole envelope morphs proportions when you switch sizes. Drag it left or right and it spins in 3D so you can see the front, the flap, and the wax seal — exactly the envelope you'll be holding when it's printed. CUSTOMIZE THE LAYOUT (Pro) Drag the address block anywhere on the envelope. Smart guides snap you to dead centre, every corner, and the centre axes. Live margin readouts show how much room you have on each side. Add your own logo above the return address; Posthaste auto-sizes it for uniform output across every envelope you print. BULK MODE — IMPORT THE WHOLE LIST AT ONCE (Pro) For Etsy, eBay, and TCGplayer sellers who need to ship a stack: • Drop in a screenshot of an order page — Vision OCR reads every address on-device • Or import a CSV (TCGplayer, eBay, or any spreadsheet with name & address columns) • Edit any address, deselect any rows, then print the entire batch to envelopes, single labels, or a sheet of Avery stickers ——————————————— PRO — $1.99 ONE-TIME UNLOCK Free download lets you print on the most common envelope sizes (#10, A7, 5×7) and save one sender + one recipient. The Pro unlock is a single $1.99 in-app purchase — no subscription, no account, no recurring charge — and adds: • All 11 envelope sizes & all 12 stick-on labels • All 7 Avery sheet templates with per-cell selection • Unlimited saved senders and recipients • 8 typography presets (Garamond, Optima, Snell Roundhand…) • Save as PDF • Bulk import from screenshot or CSV • Custom layout with snap-to guides • Sender logo (auto-sized) • Per-printer alignment calibration • iCloud sync across your devices (1.1) Family Sharing supported. Restore Purchases on every device. ——————————————— PRIVACY YOU CAN VERIFY Posthaste stores everything on your device. We don't have a server. We don't have an account system. We don't ship a single byte of your address book to anyone. The OCR runs locally on your iPhone with Apple's Vision framework — your screenshots are read on-device and never uploaded. Privacy: https://getposthaste.com/privacy Support: support@getposthaste.com Posthaste is not affiliated with Avery Dennison Corporation, Dymo, Brother Industries, or the United States Postal Service. Trademarks remain the property of their respective owners. Made for iOS 17+.
3DaysDo
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All I needed was a simple checklist before leaving home — keys, wallet, badge, umbrella. 30 seconds, then out the door. But the tools I found were designed for more complex scenarios. Project planning, team coordination, weekly reviews. Great tools for serious work, just not what I was looking for. I didn't need a system. I needed a list I could reuse every morning with one tap. There was another thing that bothered me. Tasks I'd added days ago would still be sitting there, unfinished, waiting. Some no longer mattered. But seeing them every time I opened the app gave me a feeling I couldn't quite shake. That quiet anxiety eventually made me stop opening it altogether. So I built 3DaysDo for myself — and for anyone who just wants something simple. No recurring setup. No analytics. No due dates. Add today's tasks. Tap a saved checklist to load it instantly. Check things off. 30 seconds. Done. If something isn't finished by tomorrow, you get a gentle reminder once. After 3 days, it quietly disappears on its own. No piling up. No guilt. Open the app tomorrow and it's a clean slate. Just today. Just what's in front of you. Features: • Today-only workflow — see only what matters now • 3-day auto decay — old tasks quietly disappear, keeping your list clean • Smart reminders — unfinished tasks get a gentle nudge the next day, just once • Reusable task bundles — save a checklist, load it in one tap, ready in 30 seconds • Carry-over triage — handle yesterday's leftovers simply, no piling up • Color labels — quick visual sorting, zero complexity • Home screen widget — check and complete tasks without opening the app • Daily reminders — build your planning habit • Subtask support — break bigger tasks into actionable steps • Multiple themes — make it yours • Local-only data — nothing leaves your device, your privacy matters 3Days Pro (unlock all premium features): • All premium themes • Unlimited task bundles • Extended subtask capacity • Advanced smart reminders — smarter reminder timing • Widget quick actions — complete tasks right from your home screen 3DaysDo — 30 seconds to set up. Then go live your day.
Screenshots
Verdict
Posthaste and 3DaysDo are too close to call on the numbers: across 5 compared parameters — price, ads, in-app purchases and device support among them — neither pulls far enough ahead to decide it. What separates them is feature set and interface, not measurable difference.
Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS
Both are free to download. Posthaste sells 1 one-off in-app purchase and 3DaysDo sells 1 one-off in-app purchase. Whichever you choose, the download price is not the number that matters.
| Parameter | Posthaste | 3DaysDo |
|---|---|---|
| Price | Free | Free |
| Rating | 5.0 (1 ratings) — better | — |
| Number of ratings | 1 — better | — |
| Update frequency | — | Every 3 weeks |
| Ads | No | No |
| In-app purchases | Yes | Yes |
| Monetization | Free with in-app purchases | — |
| Devices | iPhone | iPhone |
| Requires iOS | 17.0 | 17.0 |
| Further details — not scored | ||
| Size | 2 MB | 6 MB |
| Age rating | 4+ | 4+ |
| Developer | sipan Chilingaryan | 洪英 裴 |
In-app purchases
Posthaste
- Posthaste Pro$1.99
3DaysDo
- 3Days Pro$0.99









