MakeACalc (makeacalc.com) turns a plain-English description into a working, styled calculator you can embed on your own website. Every generated calculator comes with its formula, a worked example and an explanation, so visitors can check the number rather than take it on trust. A calculator can be public, or restricted to the domains you nominate. Sold here: three annual subscription plans — Creator ($39/year), Pro ($99/year) and Agency ($299/year) — which differ by how many calculators and sites they cover. No plan is metered by views or impressions. Operated by CWK Solution, India.

Lofi for focus, sleep and cozy rooms, including Mellow Mosaic, the song from the Reels. Sold by CWK Solutions.

Open a reply box on X or Instagram and a small orange ReplyFit button waits next to Reply: press it for a reply in your voice, or a tidier version of your own, next to whether that person follows you. Writing a post on X? It writes a viral post from a topic in one click, or makes your own draft go viral. You edit and press Post yourself.