
Omni Calculator
calculator.net
Build vs. Buy Calculator
DeveloperToolStack
DevNestTools
DevTools Advanced
DevTools.fit
Free, no-signup calculators for the money side of building software and freelancing

Gazelle
craigslist
OfferUp
Mercari
Recell Cellular
SwapChoice
eBay
Swappa is, in fact, an e-commerce website working as a platform for dealing with used smartphones, tablets, and mobile phones related accessories as well.

Which is more popular?
Based on our record, Swappa seems to be more popular. It has been mentioned 212 times since March 2021.
Website, pricing, platforms and company facts side by side.
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|---|---|---|
| Website | devfinancetools.com | swappa.com |
| Pricing | — | |
| Company | 2026 | — |
| Listed in |
In their own words, as submitted to SaaSHub.


DevFinanceTools is a collection of free, no-signup calculators for the money side of building software and freelancing. Everything runs in your browser — no account, no tracking beyond basic page-view analytics — and every tool shows its formulas and benchmarks so you can check the maths...
No description of Swappa yet.
What each product offers, as listed by its team.


Possible disadvantages
Walkthroughs and reviews on video.
No DevFinanceTools videos yet. You could help us improve this page by suggesting one.
The Cheapest (And Safest) Way to Buy an iPhone! | Swappa Review
More videos
How often each product is chosen within a category, 0–100% relative to the other.


Share your experience with using DevFinanceTools and Swappa. For example, how are they different and which one is better?
External articles and on-site reviews we used to compare the two products.


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When you sell on Swappa, the company takes a 10% fee on successful sales. Swappa accepts payments through PayPal, so you need an active account to buy or sell products.
Buyers pay a small fee when buying on Swappa, as Swappa helps assist with the sale to ensure all goes smoothly. The fee is refundable (typically) if the buyer isn’t happy once they’ve received the product.
Recommendations tracked on public social media and blogs since March 2021.


Tracking DevFinanceTools since Aug 2026.
If you're in the market for a replacement device, I've had success on Swappa for lightly used previous gen (and older) devices. Just make sure it has more than 4GB of RAM. Source: almost 3 years ago
Get a used Pixel 6 on swappa.com for around $250. Source: over 3 years ago
Looks like iPad is the tablet of choice by commenters so far. Just thought I'd mention that you might consider purchasing a used one from swappa.com. I've purchased 2 (not iPads) in the last few months and am very happy with both. Source: over 3 years ago
When comparing DevFinanceTools and Swappa, you can also consider the following products.

Helping you make rational decisions, one calculation at a time.
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Buy and Sell your used cell phones and electronics. Sell your iPhone, Samsung Galaxy, iPad and more for cash, or buy used iPhones, iPads and other cell phones. More than one million customers trust Gazelle.
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Online calculator for quick calculations, along with a large collection of calculators on math, finance, fitness, and more, each with related in-depth information.
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craigslist provides local classifieds and forums for jobs, housing, for sale, services, local community, and events
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Should you build an internal tool? Or just buy it?
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Instantly connect with local buyers and sellers on OfferUp! Buy and sell everything from cars and trucks, electronics, furniture, and more.
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