BugBug and Delta-QA are two no-code regression testing tools: in both cases, you record a journey by browsing your site, and the tool replays it before each production release. Both run on Chromium and let you automate your tests without writing or maintaining scripts.
They part ways on two points. The first is what gets verified at each step: BugBug checks that the journey passes and compares, pixel by pixel, the captures you add, while Delta-QA compares every step element by element. The second is the journey that makes most recorded tests fail: a new user signing up. This comparison relies on BugBug's public pages consulted in October 2026.
All our comparisons, based on verifiable criteria: Alternatives and comparisons.
Your sign-up journey replayed on every release, with no variable to write? Delta-QA creates a fresh account on each replay and tells you which element changed, with a free account and no credit card. Try Delta-QA for free →
BugBug in Brief
BugBug is an end-to-end testing tool published in Poland, aimed at any team wanting to equip itself to improve its QA. Its recorder is a Chrome extension: you click through your application, BugBug notes the steps, then replays them locally or in its cloud. Its home page presents it as a tool for "regression testing for teams shipping at AI speed".
As of 10/2026, its pricing page shows four plans, prices billed annually and excluding tax:
- Free: $0, local execution only, 1 user, 1 project, 15 tests.
- Core: $99 per month, unlimited cloud runs, scheduling, alerts, variables, JavaScript steps and a test mailbox. 3 users, 50 tests.
- Pro: $189 per month, unlimited users and tests. It adds the MCP server, visual regression, CI/CD integration and the command line.
- Business: on quote.
A 14-day free trial, with no credit card, opens up the paid plans. BugBug works with Chromium-based browsers (Chrome, Edge, Opera, Brave) and states that it does not support Firefox or Safari. No on-premise deployment is listed.
Delta-QA in Brief
Delta-QA lets the whole team verify the application, including those who do not write tests: QA people, product owners, project managers. You open your site in Delta-QA, walk through the scenario, and each step becomes a checkpoint. On the next release, Delta-QA replays the journey in a real browser and compares each page to its reference, element by element.
The report does not show a percentage of pixels: it says the "Pay" button went from blue to green, that a margin changed, that a block disappeared. You judge each difference, intended or bug.
Delta-QA runs as SaaS or, with the On-Premise offer, on your infrastructure, and the On-Premise offer can be tried with a free one-month POC. The comparison is currently done on Chromium; Firefox and WebKit are planned. The free account is created without a credit card. To place the approach, see our guide to regression testing.
Why Sign-Up Breaks Recorded Tests
A sign-up journey recorded as-is fails from the second replay. The email address entered the first time already exists, and the site answers "this address is already in use". And even with a fresh address, the journey does not stop at the form.
A real sign-up journey usually chains:
- a form with an email address, a password subject to rules, sometimes a date;
- a confirmation email, with a link to follow;
- sometimes a code received by email, to copy into the page;
- then a login with the account created, on which every other journey depends.
This is what makes sign-up the least tested journey in many applications, even though it is the front door of every new customer. BugBug and Delta-QA can both replay it. They do not ask for the same work.
At BugBug: A Test Mailbox and Variables
BugBug provides a test mailbox, the BugBug Testing Inbox, included from the Core plan. Its documentation on variables describes the procedure:
- make the address unique on each run with a built-in variable, for example
{{testRunId}}(a UUID specific to each launch) or{{timestamp}}; - open the verification email in the test mailbox and confirm the address, as a step of the test;
- reuse the generated address and password for the login that follows, through variables.
The method works, without a third-party provider. It requires understanding variables and placing them in the right spots of the test. For more elaborate values, BugBug offers JavaScript variables.
At Delta-QA: Sign-Up Replays Itself
Delta-QA treats sign-up as a journey like any other. You record it once; on replay, Delta-QA takes care of what has to change:
- A fresh email address on every replay. It is generated in a mailbox that Delta-QA reads itself. The site never sees the same address twice.
- Fresh values for the other fields. A field you have not fixed receives a value generated on each check. It can be text following a pattern, a password that complies with the rules you indicate (length, capital letter, digit) or a date offset from the replay day.
- The expected confirmation email, then its link followed. You indicate the text the page shows after the form is submitted, for example "Check your mailbox". Delta-QA waits for the page to show it, then waits for the email. If the page does not show it, the report says so, instead of blaming the email.
- A received code, read from the message. If your site sends a code to copy, Delta-QA reads it in the email. If it does not yet know where to find it, it asks you on screen, during the replay you launched, then remembers how to read it next time.
- An account kept only if everything succeeded. The account is saved only at the end of a successful sign-up, password encrypted. Your login scenarios then pick up this account, without you copying anything over.
Delta-QA does not get around the protections meant to stop bots. If your form presents a captcha, the replay stops and the report says so clearly. That is the expected behavior of a testing tool on a site that protects itself.
The difference from BugBug is not that one tool can test sign-up and the other cannot. It is who does the assembly: at BugBug, you build the mechanism with variables; at Delta-QA, it is part of the replay. When QA people or product owners are the ones covering journeys, that is often what decides whether sign-up will be tested or not.
Test your sign-up the way a new customer experiences it. Record the journey once, Delta-QA replays it with a fresh account, confirmation included. Try Delta-QA for free →
Visual Regression: A Pixel Threshold or a Per-Element Report?
BugBug offers visual regression from the Pro plan. According to its documentation, you add a capture step wherever you want to check the screen. On the first pass, the capture becomes the reference for the environment. After that, BugBug counts the pixels that differ, expresses the gap as a percentage, and the step fails if the gap exceeds the maximum allowed for that step.
The approach is clear and adjustable step by step. It leaves the tester two choices: where to place the captures, and what threshold to tolerate. A threshold too low fails legitimate renderings, a threshold too high lets through a small change that matters, such as a price or a button label.
At Delta-QA, visual comparison is not a step to add: every step of the journey is compared to its reference. And the difference is tied to an element of the page, described in plain words: its color, its margin, its font, its position, its text. You know what to look at without interpreting an image of differences. To go deeper on this choice, see our article on pixel or element comparison.
CI, AI Agents and Coded Tests
BugBug plugs its tests into a CI from the Pro plan, through its command line, its API or webhooks. Its MCP server, also on the Pro plan, lets a code agent (Claude Code, Cursor, Codex) create, run and repair tests, and review visual differences.
Delta-QA also offers an MCP server: a code agent creates a scenario, has it replayed and has it validated. For teams that already write their tests, Delta-QA now has an SDK, the Vision SDK, for Playwright in TypeScript and JavaScript. One line is enough wherever a page must be checked, and an unreviewed difference makes the test fail with the report link in the CI. It is first offered in early access: access is requested from its page.
What BugBug Does Better, Objectively
A complete functional testing tool. Conditions (if/else), JavaScript steps, handling of iframes and multiple tabs, network and console logs: BugBug covers end-to-end testing beyond visual regression.
A simple, public grid. Four plans, listed prices, unlimited users from Pro, no per-seat pricing.
Free local execution. The Free plan lets you create your first tests and run them on your machine without paying.
An integration ecosystem. Slack, Jira, Linear, Zapier, GitHub Actions, REST API and YAML import/export.
What Delta-QA Does Better, and Why It Matters
Sign-up without assembly. Fresh address, generated values, confirmation, received code, account reused by the login: it is all part of the replay, with no variable to write.
A visual check at every step. No capture to place or threshold to set: every step is compared, and the report names the element that changed.
On-Premise. Your pages and test accounts can stay inside your network, which BugBug does not list.
A multilingual site. BugBug publishes its site and documentation in English; Delta-QA publishes its site in eight languages.
Comparison Table
| Criterion | BugBug | Delta-QA |
|---|---|---|
| Test creation | Recorder (Chrome extension) or AI agent via MCP | Journey recording in Delta-QA, or agent via MCP |
| Sign-up: unique address | Variable to place ({{testRunId}}, {{timestamp}}) |
Generated on each replay, no setup |
| Confirmation email | Test mailbox (from Core), step to add | Awaited and link followed in the replay |
| Code received by email | Variables and steps to configure | Read from the message, or asked on screen then remembered |
| Account reused at login | Through variables | Picked up automatically after a successful sign-up |
| Visual regression | Capture step, pixel gap in %, per-step threshold (Pro) | Every step compared, differences described per element |
| Coded tests | No SDK listed; tests editable in YAML, API | Vision SDK for Playwright |
| Browsers | Chromium (Chrome, Edge, Opera, Brave) | Chromium; Firefox and WebKit planned |
| Hosting | BugBug cloud | SaaS or On-Premise |
| Entry price | Free local; Core at $99/month (as of 10/2026) | Free account, no credit card |
Neither is better in absolute terms. BugBug suits a team that wants a complete functional testing tool and accepts handling variables. Delta-QA suits a team that wants its critical journeys, sign-up included, verified on screen without configuring anything.
Is your sign-up tested today? Record it in Delta-QA and see the report of the first replay, no credit card. Try Delta-QA for free →
FAQ
Can BugBug test a sign-up with a confirmation email?
Yes. From the Core plan, BugBug provides a test mailbox. You make the address unique with a variable like {{testRunId}}, then add opening the email and the confirmation as steps of the test. Delta-QA does the same without a variable: the fresh address, the wait for the email and the link followed are part of the replay.
How does Delta-QA avoid the "address already in use" error?
On each replay, Delta-QA generates a fresh email address in a mailbox that it reads itself. The other fields you have not fixed also receive fresh values, including a password that complies with the rules you indicate. The site therefore sees a new user every time.
Does Delta-QA get around captchas?
No. A captcha is meant to stop bots, and a testing tool should not defeat it. If the form presents one, the replay stops and the report says so. The usual practice is to disable the captcha on the staging environment.
Do BugBug and Delta-QA work on Firefox or Safari?
Not today. BugBug states that it supports Chromium-based browsers and not Firefox or Safari. Delta-QA also compares on Chromium; Firefox and WebKit are planned.
Can you use BugBug and Delta-QA together?
Yes. BugBug can carry your detailed functional tests, with conditions and JavaScript steps, and Delta-QA the visual verification of your critical journeys, sign-up included. To compare other options, see our comparison of no-code testing software.
Does Delta-QA have a free plan like BugBug?
Delta-QA starts with a free account, no credit card, and the On-Premise offer is evaluated through a free one-month POC. BugBug's free plan runs tests locally only; its cloud runs start at the Core plan.