If you're building a deck with five charts and you generate each one fresh in Chartissimo, the result reads as five different design directions on five different slides. Stakeholders catch this in a fraction of a second, even when they can't articulate it. The fix lives in two features that work together: favorites and lock seed.
This is the workflow for making every chart in a deck visually consistent — same palette, same treatment, same look — without rebuilding from scratch each time.
The mental model
Each Chartissimo render uses three inputs: your data, the style you picked, and a random seed that controls visual variation within that style (specific shadows, gradient angles, accent placement). Re-rendering with the same data and same style but a different seed produces a different-looking chart. Re-rendering with the same data, same style, and the same seed produces a consistent chart.
Favorites capture the style and settings. Lock seed pins the visual variation. Together, they guarantee every chart in the project looks like a sibling of the first one.
Step 1: Build the first chart and save it as a favorite
Build the first chart in your deck the way you normally would — paste the data, pick the chart type, apply a brand color, pick or describe a style, generate. Iterate until it looks the way you want.
When you're happy with it, click Save as Favorite in the right-hand action sidebar. The finished style — including brand color, custom prompt, background mode, and the seed that produced this specific look — gets captured into your favorites.
Give it a name that reflects the deck or project ("Q3 Board Deck", "Acme Pitch", "Annual Report 2026") so it's easy to find later.
Step 2: Build the next chart from the same favorite
For the second chart in the deck, paste the new data into a fresh chart, pick the chart type, then go to the Favorites tab in the style picker. Click your saved favorite.
The favorite's brand color, style prompt, and background mode all populate automatically. The only thing different from the first chart is the data.
Step 3: Leave Lock Seed on
When you select a favorite, an options panel appears with the Lock Seed (consistent look) checkbox — checked by default. Leave it checked.
This is the part that makes consistency happen. With Lock Seed on, the new chart renders using the same seed as the original favorite — so the two charts come out visually consistent. With Lock Seed off, the AI re-rolls the visual variation and you'd get a chart in the right palette and style but with different shadows, gradients, and accent placement.
Mental shortcut: Lock Seed on = "make this look like the favorite." Lock Seed off = "use the favorite's palette and style but give me a fresh take."
Step 4: Generate and download
Click generate. The chart renders with the locked seed, comes out visually consistent with the original favorite, and you download the PNG the same way you always do.
Repeat for every chart in the deck. Five charts, one favorite, five renders that all look like they belong together.
What "consistent" actually means
With this workflow, charts in the deck share:
- The same brand color anchor — every chart's primary color is your brand hex
- The same visual treatment — same gradient direction, same shadow weight, same texture, same edge style
- The same background mode — all white, all black, or all contextual; no awkward mix on the deck
- The same overall mood — restrained or playful, dense or airy, photographic or vector
What can still differ legitimately: chart type (a pie next to a bar is fine), data scale (one chart with three categories, another with eight), and label density. Lock seed pins the style; it doesn't pretend the data is identical.
When to skip the lock
The default is to leave Lock Seed on, but there are cases to deliberately turn it off:
- You want a hero chart that stands out. Use the favorite for the supporting charts but generate the hero with the lock off so it has a slightly different visual energy. The deck still feels coherent because the palette and style are shared.
- The first render of the favorite was a fluke. If the original chart had a great palette but an unfortunate gradient angle, turn lock off on the next chart and find a new seed you like better — then re-save that one as the canonical favorite for the deck.
- You're A/B-testing variations for a client review. Generate three rerolls with lock off to get distinct treatments in the same palette, and let the client pick.
The handoff trick
If someone else on your team is going to add charts to the same deck later, share the favorite with them — the saved style is account-level and travels with anyone added to your workspace. They paste their data, pick the favorite, lock the seed, generate. The deck stays consistent across people, not just across charts.
The bottom line
Visual consistency across a deck used to be a manual job — pick the same colors each time, eyeball the shadows, hope the result reads as a set. Save the first chart as a favorite, leave Lock Seed on for every chart after that, and the deck looks designed by one person at one moment in time. Stakeholders read that as professional. The work to get there is one extra click per chart.