Grammarly vs QuillBot: Which AI Writing App to Use on a Phone
QuillBot for most people: more free tools, a keyboard on both iPhone and Android, and a Premium plan that costs $19.99 a month against Grammarly's $29
Runway if you want to try the same shot on several of the best video models without several subscriptions; Luma Dream Machine if you are working on footage you already have and want to reshape it. Both score 6.9 on our five criteria, and the tie is real: Runway is easier to use, Luma's 1080p renders and editing tools are deeper. Both meter every render from the first clip — Runway with a one-time 125 free credits, Luma at 400 credits for five seconds of 1080p. Prices as of October 2026.
Choose Runway to compare models. Seedance 2.5, Kling 3 Pro, Gen-4.5 and Nano Banana Pro sit behind one credit balance, and its Agent builds a video from a chat conversation rather than a timeline. Choose Luma Dream Machine to work on a shot. Its Ray3.14 model renders native 1080p, and Modify, Reframe, keyframes and Draft previews let you change footage, including footage you shot yourself, instead of starting again.
Runway is a front door to many models. The idea is simple and useful: the same prompt can go to several of the strongest video generators, and you keep the one that worked. Its Agent turns that into a conversation — describe the video, refine it in plain language, and let the app decide the steps. Our core function score is 8.0, with the caveat from reviewers that prompt details get ignored, on-screen text comes out misspelled and characters shift between shots.
Luma is an editing tool built on its own model. Draft previews let you check a shot cheaply before paying for the full render; Modify changes an existing clip; Reframe changes the aspect ratio without cropping the subject out; keyframes control where a shot starts and ends. Its core function also scores 8.0, with reviewers reporting ignored prompts and drifting faces.
Runway's free plan is a one-time 125 credits — spent in an afternoon, never refilled. Paid tiers start at $12 a month, credits do not roll over below the Max tier, and every retry spends from the same balance. Reviewers say a subscription often still ends in buying extra packs. Its monetisation scores 5.0.
Luma meters every render from the first clip. A five-second 1080p clip takes 400 credits, the $30 Plus plan on Luma's website includes 10,000 — about 25 such clips a month — there is no monthly rollover, and sound is a separate paid step. Its monetisation scores 5.5.
Neither has a free tier worth calling one. If you only want to experiment, Google Flow's 50 credits a day are the better place to learn before paying either of these.
Both scored 6.5 for privacy. Runway's terms allow training on your inputs and outputs, and Apple lists tracking identifiers; Google Play declares no third-party sharing. Luma's label shows no tracking, but data is linked to your account and its terms license your uploads for model training. In both, assume what you upload can help train the model — keep footage of other people out unless they have agreed.
Take one brief: a ten-second shot of a coffee cup on a café table, steam rising, the camera slowly pushing in. In Runway you write it once and send it to two or three models, then compare. One model gets the steam right and the cup wrong; another the reverse. You keep the best and spend credits on retries of that one. The Agent can also take the brief as a conversation — make it warmer, slow the push — and rebuild the clip without you touching settings.
In Luma Dream Machine you would start with a Draft to check the framing cheaply, then render the full 1080p shot. If the cup is right but the frame is wrong for a vertical post, Reframe changes the aspect ratio rather than generating again; if the steam is wrong, Modify works on the clip you already paid for. Luma does not give you a second opinion from a different model, but it lets you finish the one you have.
The cost difference follows from that. In Runway the expensive habit is generating the same idea on every model; in Luma it is rendering full clips before checking drafts. Used the way each is designed, both make one usable shot cheaper than the headline price suggests.
A social-media creator who needs many short, different clips a week will get more from Runway: variety is the job, and comparing models is how you avoid every clip looking the same. A small business making one product video, or anyone fixing travel footage, will get more from Luma, where the tools are about making one clip right. If neither describes you yet, wait — learn on a free daily allowance elsewhere first, because both of these start metering on the first render.
Runway's ease of use scores 7.5 against Luma's 7.0. The chat-first Agent needs no timeline, and moving one idea across four models is something no single-model app can offer. Its installs are smaller too — 91 MB on Android and 129 MB on iPhone — and its performance scores 7.0 against Luma's 6.5. If you do not yet know which model suits your style, Runway is how you find out without four subscriptions.
Luma wins on control. A cheap Draft preview before a full render saves credits on bad prompts; Modify and Reframe let you fix a clip instead of regenerating it; keyframes give you the first and last frame you want. For anyone editing real footage — a product video, a travel clip, a shot that is nearly right — that is worth more than a menu of models. Its 1080p is native rather than upscaled.
Runway is the better app for exploring: one bill, several top models, and an Agent that builds the video from a conversation — at the cost of a one-time free allowance and credits that do not roll over. Luma is the better app for finishing: native 1080p, drafts before you pay, and tools that reshape a clip instead of replacing it. If you can only pay for one, decide whether your problem is finding a look or fixing a shot.
Runway for trying several top video models from one subscription and building clips by chat; Luma for editing existing footage with Modify, Reframe and keyframes at native 1080p. Both score 6.9 on our criteria.
Only to try. The free plan is a one-time 125 credits that do not refill, and every retry spends from the same balance. Paid tiers start at $12 a month as of October 2026.
A five-second 1080p clip takes 400 credits. The $30 Plus plan on Luma's website includes 10,000 credits, roughly 25 such clips a month, and sound is a separate paid step.
Their terms allow it. Runway's terms permit training on inputs and outputs, and Luma's terms license uploads for model training. Keep footage of other people out unless they have agreed.
QuillBot for most people: more free tools, a keyboard on both iPhone and Android, and a Premium plan that costs $19.99 a month against Grammarly's $29
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